Hidan Kizuna (voiced by Kenji Akabane) seems to be a very ordinary boy. Under the arrangement of his sister Reiri Hidan (voiced by Rika Igawa), he entered the Strategic Defense Academy Ataraxia to study. The girls living here all have their own magic armors, hoping to become a qualified warrior by learning how to operate them. In fact, Hidan Kizuna has a special ability, which is to increase the power of the girls' armor by touching their bodies. Chidorigafuchi Aine (voiced by Tomo Kageyama), who is cold on the outside but warm on the inside, Yurishia (voiced by Chinatsu Akasaki), who is passionate and unrestrained and has a proud figure, and Himekawa Eiryu (voiced by Juri Nagatsuma), the discipline committee member, quickly made friends in the academy.